Vertical tank



FIG. 1 is a top perspective view of the vertical tank showing my new design;

FIG. 2 is a front view of the vertical tank;

FIG. 3 is a back view of the vertical tank;

FIG. 4 is a right side view of the vertical tank;

FIG. 5 is a left side view of the vertical tank;

FIG. 6 is a top view of the vertical tank; and,

FIG. 7 is a bottom view of the vertical tank.

The broken line showing is included for the purpose of illustrating and forms no part of the claimed design. 

CLAIM The ornamental design for a vertical tank, as shown and described. 